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AD22105ARZ Folha de dados(PDF) 1 Page - Analog Devices |
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AD22105ARZ Folha de dados(HTML) 1 Page - Analog Devices |
1 / 8 page REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Low Voltage, Resistor Programmable Thermostatic Switch AD22105 © Analog Devices, Inc., 1996 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 FEATURES User-Programmable Temperature Setpoint 2.0 C Setpoint Accuracy 4.0 C Preset Hysteresis Wide Supply Range (+2.7 V dc to +7.0 V dc) Wide Temperature Range (–40 C to +150 C) Low Power Dissipation (230 W @ 3.3 V) APPLICATIONS Industrial Process Control Thermal Control Systems CPU Monitoring (i.e., Pentium) Computer Thermal Management Circuits Fan Control Handheld/Portable Electronic Equipment The AD22105 is designed to operate on a single power supply voltage from +2.7 V to +7.0 V facilitating operation in battery powered applications as well as in industrial control systems. Because of low power dissipation (230 µW @ 3.3 V), self- heating errors are minimized and battery life is maximized. An optional internal 200 k Ω pull-up resistor is included to facilitate driving light loads such as CMOS inputs. Alternatively, a low power LED indicator may be driven directly. GENERAL DESCRIPTION The AD22105 is a solid state thermostatic switch. Requiring only one external programming resistor, the AD22105 can be set to switch accurately at any temperature in the wide operating range of –40 °C to +150°C. Using a novel circuit architecture, the AD22105 asserts an open collector output when the ambient temperature exceeds the user-programmed setpoint temperature. The AD22105 has approximately 4 °C of hysteresis which prevents rapid thermal on/off cycling. FUNCTIONAL BLOCK DIAGRAM 1 2 3 4 8 7 6 5 NC VS RSET NC RPULL–UP OUT GND NC TEMPERATURE SENSOR 200k Ω SET– POINT AD22105 12 3 4 8 7 65 OUT +2.7V TO +7.0V RSET AD22105 TOP VIEW Figure 1. Typical Application Circuit |
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